// Slave select pins
#define BUTTERFLY	PB4
#define MCP			PB3

void SPI_MasterInit(void);

void enable_spi_transmission(uint8_t slave);

void disable_spi_transmission(uint8_t slave);

uint8_t SPI_read(void);

void SPI_write(char cData);

void SPI_MasterSend(char string[28]);
